<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button @click="showAddCateDialog" type="primary"
            >商品分类</el-button
          >
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        class="treeTable"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen"
            v-if="scope.row.cat_deleted === false"
          ></i>
          <i class="el-icon-error" style="color: red" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            v-else-if="scope.row.cat_level === 1"
            type="success"
            >二级</el-tag
          >
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <!-- //操作 -->
        <!-- eslink-disable-next-line -->
        <template slot="opt" slot-scope="{}">
          <el-button size="mini" type="primary" icon="el-icon-edit"
            >编辑</el-button
          >
          <el-button size="mini" type="danger" icon="el-icon-delete"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 7, 9]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类 -->
    <el-dialog
    @close="addCateDialogClosed"
    title="提示" :visible.sync="addCateDialogVisible" width="50%">
      <!-- 添加分类表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader
            expand-trigger="hover"
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //查询条件
      querInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类数据列表
      catelist: [],
      //数据总条数
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          //表示，将当前列定义为模板列
          type: "template",
          //表示当前这一列使用模板名称
          template: "isok",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      //控制添加分类对话框的显示和隐藏
      addCateDialogVisible: false,
      //添加分类的表单数据对象
      addCateForm: {
        //将要添加的分类名称
        cat_name: "",
        //父级分类的ID
        cat_pid: 0,
        //分类等级
        cat_level: 0,
      },
      //添加分类表单验证规则对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps:{ 
          value:'cat_id',
          label:'cat_name',
          children:'children'
      },
    //选中的父级分类ID数组
      selectedKeys:[]
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.querInfo,
      });

      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败！");
      }
      //console.log(res.data)
      //把数据列表赋值给catelist
      this.catelist = res.data.result;
      //为总数居条数赋值
      this.total = res.data.total;
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.querInfo.pagesize = newSize;
      this.getCateList();
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.querInfo.pagenum = newPage;
      this.getCateList();
    },
    //点击按钮展示分类对话框
    showAddCateDialog() {
      //先获取父级分类列表
      this.getParentCateList();
      this.addCateDialogVisible = true;
    },
    //父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据列表失败");
      }
      this.parentCateList = res.data;
    },
    //选择项发生变化出发这个函数
    parentCateChanged(){
        //console.log(this.selectedKeys)
        //如果selectedKeys数组中的len大于0
        if(this.selectedKeys.length>0){
          //父级分类ID
          this.addCateForm.cat_pid=this.selectedKeys[ 
            this.selectedKeys.length-1
          ]
          this.addCateForm.cat_level=this.selectedKeys.length
          return
        }else{
          this.addCateForm.cat_pid=0
          this.addCateForm.cat_level=0

        }
    },
    //添加按钮
    addCate(){
      //console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid=>{
        if(!valid) return 
        const {data:res}=await this.$http.post('categories',this.addCateForm)
        if(res.meta.status!==201){
          return this.$message.error('添加分类失败')
        }
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible=false
      })
    },
    //监听对话框的关闭事件，重置表单数据
    addCateDialogClosed(){
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys=[]
      this.addCateForm.cat_level=0
      this.addCateForm.cat_pid=0
    }
  },
};
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader{ 
    width: 100%;
}
</style>